Saurav bought two items for Rs. 680 and Rs. 820 respectively. He sold the first item at a 5% loss and the second item at a 15% profit. Find his overall profit or loss percentage in the entire transaction (correct to 2 decimal places).

A company considers hiring an extra machine for $150 per day to produce additional units. If the additional throughput contribution generated from producing these units on the machine is $390, by how much will total profit increase?

If the cost price of an article is 85 times its selling price, what is the loss percentage?